US2160841A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Thermal dehydration of aliphatic acids
Assignee: Henry Dreyfuss Associates LLC
•
Filing: 1937-07-09
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Granted: 1939-06-06
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Expires: 1957-07-09
Abstract
No abstract record available.
Inventors
- 👤 Dreyfus Henry
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 00:54
CPC Classifications
C; C07; C07C; C07C45/00; C07C45/87; C07C45/89; C07C51/00; C07C51/54; C07C51/56
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1942-06-05 | 1942-12-05 | 1943-06-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1946-06-05 | 1946-12-05 | 1947-06-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1950-06-05 | 1950-12-05 | 1951-06-06 | $7700.00 | Window Closed / Lapsed |